Which of the following reagents can be used to convert primary amides into primary amines containing the same number of carbon atoms ?

Options

A. `Br_(2)+NaOH`
B. `LiAIH_(4)`
C. `Sn+HCl`
D. `Na+C_(2)H_(5)OH`

Answer

B

Explanation

Reduction with `LiAIH_(4)` converts `-CONH_(2)` to `-CH_(2)NH_(2)` (`1^(@)` amines) with same number of carbon atoms. In constrast, `Br_(2)+NaOH` will bring about Hofmann bromamide reaction giving `1^(@)` amines with one carbon atom less than the parent amide. For example,
`RCONH_(2) overset(LiAIH_(4)) to RCH_(2)NH_(2)`
`RCONH_(2) overset(Br_(2)+NaOH) to RNH_(2)`